import service from './request'
import { ResponseData } from './request'

// 上传响应数据
export interface UploadResponse {
  url: string          // 文件访问地址
  fileName: string     // 文件名
  fileSize: number     // 文件大小（字节）
  fileType: string     // 文件类型
}

/**
 * 上传文件到阿里云 OSS
 * @param file 文件对象
 * @param onProgress 上传进度回调
 * @returns Promise<ResponseData<UploadResponse>>
 */
export function uploadFile(
  file: File,
  onProgress?: (progressEvent: any) => void
): Promise<ResponseData<UploadResponse>> {
  const formData = new FormData()
  formData.append('file', file)

  return service.post('/oss/upload', formData, {
    headers: {
      'Content-Type': 'multipart/form-data'
    },
    onUploadProgress: onProgress
  })
}

/**
 * 批量上传文件
 * @param files 文件数组
 * @param onProgress 上传进度回调
 * @returns Promise<ResponseData<UploadResponse[]>>
 */
export function uploadFiles(
  files: File[],
  onProgress?: (progressEvent: any) => void
): Promise<ResponseData<UploadResponse[]>> {
  const formData = new FormData()
  files.forEach((file) => {
    formData.append('files', file)
  })

  return service.post('/oss/upload/batch', formData, {
    headers: {
      'Content-Type': 'multipart/form-data'
    },
    onUploadProgress: onProgress
  })
}

/**
 * 上传图片（带图片压缩和格式验证）
 * @param file 图片文件
 * @param options 配置选项
 * @returns Promise<ResponseData<UploadResponse>>
 */
export interface UploadImageOptions {
  maxSize?: number        // 最大文件大小（MB），默认 5MB
  allowedTypes?: string[] // 允许的文件类型，默认 ['image/jpeg', 'image/png', 'image/gif', 'image/webp']
  onProgress?: (progressEvent: any) => void
}

export function uploadImage(
  file: File,
  options: UploadImageOptions = {}
): Promise<ResponseData<UploadResponse>> {
  const {
    maxSize = 5,
    allowedTypes = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'],
    onProgress
  } = options

  // 验证文件类型
  if (!allowedTypes.includes(file.type)) {
    return Promise.reject(new Error(`只支持上传 ${allowedTypes.join(', ')} 格式的图片`))
  }

  // 验证文件大小
  const maxSizeBytes = maxSize * 1024 * 1024
  if (file.size > maxSizeBytes) {
    return Promise.reject(new Error(`图片大小不能超过 ${maxSize}MB`))
  }

  return uploadFile(file, onProgress)
}

/**
 * 上传文档（Word、Excel、PDF 等）
 * @param file 文档文件
 * @param options 配置选项
 * @returns Promise<ResponseData<UploadResponse>>
 */
export interface UploadDocumentOptions {
  maxSize?: number        // 最大文件大小（MB），默认 10MB
  allowedTypes?: string[] // 允许的文件类型
  onProgress?: (progressEvent: any) => void
}

export function uploadDocument(
  file: File,
  options: UploadDocumentOptions = {}
): Promise<ResponseData<UploadResponse>> {
  const {
    maxSize = 10,
    allowedTypes = [
      'application/pdf',
      'application/msword',
      'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
      'application/vnd.ms-excel',
      'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
      'application/vnd.ms-powerpoint',
      'application/vnd.openxmlformats-officedocument.presentationml.presentation'
    ],
    onProgress
  } = options

  // 验证文件类型
  if (!allowedTypes.includes(file.type)) {
    return Promise.reject(new Error('不支持的文档格式'))
  }

  // 验证文件大小
  const maxSizeBytes = maxSize * 1024 * 1024
  if (file.size > maxSizeBytes) {
    return Promise.reject(new Error(`文档大小不能超过 ${maxSize}MB`))
  }

  return uploadFile(file, onProgress)
}

/**
 * 删除文件
 * @param url 文件地址
 * @returns Promise<ResponseData<void>>
 */
export function deleteFile(url: string): Promise<ResponseData<void>> {
  return service.post('/oss/delete', { url })
}

/**
 * 获取文件临时访问地址（用于私有文件）
 * @param url 文件地址
 * @param expires 过期时间（秒），默认 3600
 * @returns Promise<ResponseData<{ url: string }>>
 */
export function getFileUrl(url: string, expires = 3600): Promise<ResponseData<{ url: string }>> {
  return service.post('/oss/getUrl', { url, expires })
}